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Hi <@U01819B63HP> , i included the .spiceinit file , but still seems slow. The crash was gone after i closed the other xschem terminals . Seems some memory issue at my virtual bocx , but not sure. Any suggestions.

<@U02NNT94BK8> Stefan's instructions were to create a `simulations/.spiceinit` file with the following contents:
```set ngbehavior=hsa
set ng_nomodcheck 
# set filetype=ascii```
You said that you included it, which is not the same thing.
Hopefully this helps. Besides the total elapsed run time, the only major difference I see between your result and Stefan's is the library pages.

<@U017X0NM2E7> , yes i created the file and included the commands.. Am i missing anything ?

<@U017X0NM2E7> I just installed `open_pdks`, which takes care of downloading skywater spice models and patching them in many places. My open_pdks version is :
```commit 3a2a72e112d12771f528ed8b79b799222728e7eb (HEAD -&gt; master, tag: 1.0.316, origin/open_pdks-1.0, origin/master, origin/HEAD)
Author: Tim Edwards &lt;tim@opencircuitdesign.com&gt;
Date:   Mon Jun 27 14:08:22 2022 -0400

    Corrected the sky130 JSON file to add a couple of missing commas
    that break JSON syntax.```
installed using the usual:
`./configure --enable-sky130-pdk --prefix=/home/schippes`
`make`
`[sudo] make install`
in my case no sudo is necessary since i install in my home dir.

Thanks <@U01819B63HP>. The cause might be in the pdk then. I get results closer to <@U02NNT94BK8>
```Total analysis time (seconds) = 12.1835

Total CPU time (seconds) = 2714.315 

Total DRAM available = 128931.973 MB.
DRAM currently available = 96590.703 MB.
Maximum ngspice program size = 1526.375 MB.
Current ngspice program size = 1499.145 MB.

Shared ngspice pages =    9.801 MB.
Text (code) pages =    5.574 MB.
Stack = 0 bytes.
Library pages = 1489.930 MB.


real	45m14.954s
user	45m9.544s
sys	0m4.787s```
I'll try building the pdk locally instead of using the canned version and see what the difference is.

<@U017X0NM2E7> During the 45' simulation is the CPU (at least the cores allocated to ngspice) running at full 100%? If not there is some other bottleneck, mat be some I/O issue...

I didn't watch the whole time, but when I did look, it was at 100%.

Well I tried the pdks for mpw-7a and got the same run times. I tried creating the pdks from the latest open_pdks, but still no change.

<@U02NNT94BK8> Try putting the `.spiceinit` in the same directory that you run `ngspice`. That worked for me.
```Total analysis time (seconds) = 12.0473

Total CPU time (seconds) = 34.669 

Total DRAM available = 128931.973 MB.
DRAM currently available = 41720.793 MB.
Maximum ngspice program size =  691.812 MB.
Current ngspice program size =  664.605 MB.

Shared ngspice pages =    9.629 MB.
Text (code) pages =    5.574 MB.
Stack = 0 bytes.
Library pages =  655.367 MB.


real	0m34.696s
user	0m31.774s
sys	0m2.920s```